SideInput load config

SideInput.java

      PCollection<Long> ticks = p
                    // Produce 1 "tick" per second
                    .apply(GenerateSequence.from(0).withRate(1, Duration.standardSeconds(1)))
                    // Window the ticks into 1-minute windows
                    .apply(Window.into(FixedWindows.of(Duration.standardSeconds(1))))
                    // Use an arbitrary per-window combiner to reduce to 1 element per window
                    .apply(Combine.globally(Count.<Long>combineFn()).withoutDefaults());

            String bucketName = options.getBigQuerySchemaConfigBucketName().get();

            PCollectionView<FieldsConfiguration> sideView = ticks
                    .apply(MapElements.into(TypeDescriptor.of(FieldsConfiguration.class)).via((Long ignored) -> getFieldsConfiguration(bucketName)))
                    .apply(View.<FieldsConfiguration>asSingleton().withDefaultValue(getFieldsConfiguration(bucketName)));